SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c31d6b8ddf2e8e578288f14952622d68f4baf3a8b2f1949ea8c5d862c1c25fc' 
  AND token = 'wYhsqvleDGrqJ/mQl2PXH3o4M5K2f7WqKMaB9/Q4PR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}